You are not given a choice between policies of Obama or Romney because they are basically identical, and Ron Paul has been sidelined by the GOP. So, what other option do you have?
This one! Take the time to check out the other option, be informed and initiate your own reasoning.

“The only way you are going to throw your vote away if to vote for someone you know is going to betray you” - Tom Mullen of the Washington Post

BTW: It looks like Gary Johnson is going to take Ohio over Romney.